Preconfiguration "PmExpr - mathematical expression"

Creation and evaluation of mathematical JavaScript expression by the PmExpr object.

This preconfiguration can be activated when creating a new object (e.g. by "New object ..." in the local object menu or by pressing the Insert key after selecting the object) and is included in the group: "/ Panels (PmaPanel) / Others examples".
This preconfiguration can be created in the object: PmaFolder or PmaRoot.

- The preconfiguration creates an object of the PmaFolder type containing PmaPanel and PmaData objects.
- The preconfiguration is created including the panel (object of the PmaPanel type) is functional also as Web panel.

This preconfiguration allows to test and evaluate user created mathematical expression (PmExpr) in the JavaScript language syntax. There are predefined variables that can be used in the expression.

In this preconfiguration, there are static predefined variables in the "ListVariables" method of the created PmaFolder object. The "ResultExpr" method of this object then returns the evaluated expression that was previously passed to it in its parameter.

The testing panel PanelMain demonstrates the possible entries of mathematical expression in three examples. On the right side there is the evaluated value. On the bottom there are the real values of variables that can be used in the expression. The objects used as expression entries or for displaying the results can be edited locally and their modification is immediately resulting in change of the resulting evaluated value.

From panel PanelMain it is possible to open PanelExpr panel by the button. It can be used as simple mathematical expression editor where it is possible to use the buttons from the left to right in order to create desired expression. It is also possible to edit it also locally on spot.
These configurators can be set before the preconfiguration is created:
The name of created objectName of the object created in the Pma objects tree. The maximum name length is 30 characters. This is a system name, so it must contain only alphanumeric and must not contain any diacritics (i.e. national dependent characters), empty string, spaces and the first character must not be a number.
Default: "PmExpr"
Enable as Web componentSpecifies whether this object has to be registered as a Web server component
After the preconfiguration is created, the "PmaPanel > Web server > Enable as Web component" configurator will be set to this value.
PmaWeb objectPath in the Pma objects tree to the object PmaWeb, PmaWebFolder or PmaWebLang where the registration is carried out.
Macro expression can be used for input (it is evaluated after the application is launched).
After the preconfiguration is created, the "PmaPanel > Web server > PmaWeb object" configurator will be set to this value.

Pm8.03.20: Created
PROMOTIC 9.0.27 SCADA system documentation MICROSYS, spol. s r.o.

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